NIB Barrett Semi-Auto M107A1-S 50 BMG 20",Recoil-operated, semi-automatic action with improved internal components. Features a 20" fluted barrel, Tungsten Gray finish, A2 pistol grip, thermal cheek guard, titanium monopod and bipod, QD suppressor-mount muzzle brake, and flip-up rear sight. Includes a Pelican hard case. Overall length is 48", with a 1:15 twist rate and a listed weight of 28.7 lb. Designed for use with a QDL suppressor.